In the Project DRIBBLE Salmon Event a 5-kt nuclear device was detonated near the bottom of a 2,720-foot-deep hole drilled vertically into a salt dome in Mississippi. The report describes work by the U. S. Army Engineer Waterways Experiment Station in (1) furnishing grouting consultant services and technical assistance in the field during grouting operations, (2) conducting stemming studies for the device emplacement hole, (3) developing formation- matching grouts for use in grouting instruments in place in deep drilled holes, (4) providing instruments for hole temperature determinations, and (5) making physical tests on salt cores from the project site. Based on the results of this investigation, the following conclusions are made. (1) Grout mixtures were successfully developed to meet all job requirements. (2) With the exception of one hole, all instrument holes were successfully grouted. (3) The stemming operation for the device hole was highly successful in all respects. (4) Modifications and the addition of supplemental mixing equipment to the grouting systems considerably improved the quality control of the grout mixture. This improved quality control is believed to have been largely responsible for the successful grouting of the device and instrument holes.